noxon



(Model.)

' J. 8v T. H. NOXON.

SPRING HOB POR GRAIN DRI-LLS.

No. 258,465. Patented May 23, 1882.

n. Panna Phmumagmpner. wMr-mgmn. n. Q

llmTne STaTns PATENT Trice,

JAMES NOXON AND THOMAS H. NOXON, OF INGERSOLL, ONTARIO, CANADA.

SPRING-HOE FOR GRAIN-DRILLS.

SPECIFICATION forming part of Letters Patent No. 258,465, dated May 23, 1882,

Application tiled December 22, 1881. (Model.)

To all whom it may concern Be it known that we, JAMES NoxON and THOMAS H. NoxoN, both of Ingersoll, in the county of Oxford, in the Province of Ontario, Canada, have jointly invented certain newand useful Improvements in Spring-Hoes for Grain- Drills; and we do hereby declare that the following is a full, clear, and exact description ofv part of said plate D or iin O the drag-bars A the same.

This invention relates to the spring-hoes of grain-drills, and has for its object to adjust the rigidity of the hoe to suit various conditions ofthe ground in which it works, and to yield to pass over foreign obstructions and automatically resume its normal position for drilling. The improvement also eii'ects a saving in the cost ot' manufacture as compared with hoes of a like class.

Our invention consists in the combination, with the drag-bars aud hoe of a grain-drill, ot' links pivoted to the iin of a hoe or to an intermediate connecting-plate, a rockingcylinder journaled in line with said links, which connect therewith by a ixed crank-arm on said cylinder, a spring wound around said cylinder, the free end ofthe spring attached thereto and the other end to a tixtnre on or in connection with the draft-bars, and an eccentric having a face locking with the end ot' a cylinder, which is clamped between the drag-bars, said eccentric having connection with an arm ofthe rocking cylinder, so tha-tbythe adjustment of the eccentric to raise or lower the arm of the cylinder a variable lock of greater or less rigidity is maintained bythe aligned position of the pivotal connect-ions to resist the impact ofthe hoe striking an obstruction, and after such impact yield to pass over the obstruction, the spring then closing around its cylinder, which is rocked by the yielding ofthehoe, and reacted by the expansion of the spring to restore the hoc to its normal position l'or drilling.

Figure lisa side elevation ofthe drag-bars and hoe of a grain-drill, showing the rocking cylinder, spring, connecting-links, and adjusting devices. Fig. 2 is a sectional elevation of the same, showing the yielding movement of the hoc and connecting parts in dotted lines. Fig. 3 is atop view, and Figs. et and 5 are detail views.

A A are the parallel drag-bars; B, the hoe having fin C; and D, a plate pivoted thereto and clamped by a bolt and nut passingthrough a curved slot, whereby the pitch ot' the hoe can be regulated. In practice we may dispense with the plate D in carrying out our present invention, as it is not essential thereto.

F F are parallel links pivoted at one end to a forward projection, E, on plate l), or tin O when the former is not used, and to the lower A are pivoted by a bolt, P, which constitutes the fulcrum of movement ot' the hoe. H is a rocking cylinder axially journaled between the drag-bars A A, and is connected pivotally to the lower ends of links F F by a lug, Gr, the

pivotal connection being approximately in line to the axis ot' cylinder H and the ripper pivotal connection of bar F with the hoe, whereby a locking ofthe parts results, which is broken by throwing them out ot' line, in which case the links F F will bear down the lug Gr to a crank position, as shown in dotted lilies in Fig. 2, and which position is assumed when the hoe is passing over an obstruction.

J is a spring' wound spirally around the cylinder H. rlhe free end ot' the spring is secured to a lug, l. projecting from said cylinder at one end. The opposite end of the spring is fastened to lug K on a. `Banged projection, M, which forms part of a tixed cylinder, L, axially secured between the bars A A, and which cylinder-projection and lug con line the end of the spring fixedly, whereby when the free end of the spring is compressed around the cylinder the tension of the spring is distributed throughout its whole length, so that when it reacts by expansion the spring rocks the cylinder H, and thereby draws the hoe to its normal position after it has passed an obstruction. At the opposite end of cylinder L is placed axially therewith an eccentric, O, which is provided with a serrated face lockingwith a corresponding face on the end of cylinder L, said eccentric forming a stop for an arm, N, integral with the cylinder H, so that by adjusting the eccentric the arm N will be raised and lowered to throw the pivot-connection of G and F ont of approximate alignment with the axis ot' cylinder Hand pivot-connection of F and D, whereby the resistance of the hoe to an obstruction will be weakened or strengthened at the impact according to the distance at which said central pivot may be set by the adjust- IOO ment of the eccentric on its axis. After the impact of the hoe with its obstruction has overcome the resistance the hoe will yield to pass over the obstruction by the compression of the spring around its cylinder by the depression of the links F F, causing the cylinder H to rock, and when the spring expands the cylinderl is reacted, and thereby draws the 110e to its normal position after it has passed the obstruction.

We are aware that volute coiled springs and spiral-spring coils having an endwise tension have been used to retain the hoe and allow it to yield to pass over an obstruction; but these do not possess sufficient rigidity combined with retentive power to meet requirements suited to the variable condition and character of the ground in which the drill is worked.

NVe claim as our invention- 1. In a grain-drill, the combination, with the hoe B and drag-bars A A, of a rocking cylinder, H, axially joulrnaled between the drag-bars, spring J, wound spirally around said cylinder, the free end secured to a lng, I, of the cylinder, the other end attached to a tixture, links F F, pivoted to a lug, G, of the cylinder, and to a plate, D, or fin C oi' the hoe above the pivot-point of its connection with the dragbars, and eccentric O, forming a stop for an arm, N, of cylinder H, whereby the primary resistance of the hoe to an obstruction can be weakened and strengthened by throwing the pivotal end of links F F more or less out of line with the axis of cylinder H by the adjustment of the eccentric O, raising and lowering the arm N, the spring J reacting to retract the hoe to a normal position after yielding to and passing over an obstruction, as set forth.

2. In combination with a cylinder, H, journaled between the drag-bars of a grain-drill, and spring J, wound spirally around said cylinder, the cylinder L, axially secured between the drag-bars bya clamping-bolt, and provided with interlocking faces, for the purpose set forth.

3. In combination with spring J, wound around a cylinder, H, journaled between dragbars A A, pivoted to the hoes B or plate 1), and connected to the hoes by links F F, the cylinder L, axially secured between the bars A A, and having a flange, M, and projection K, to secure the end ot' spring J ixedly, as set forth.

JAMES NOXON. THOMAS H. NUXON.

Witnesses:

G. E. PERKINS, JNO. W. SI-IAVER. 

